“…(a) Configurations 4s-4p and p n (n = 2, 3, 4). In references [20][21][22], we have analyzed the Zn-like 4s-4p isoelectronic sequence, the ground configurations p 2 (C, Si, Ge, Sn, Zn and Cd sequences), p 3 (N, P and As sequences) and p 4 (O and S sequences). Levels can be faithfully fitted only by means of expressions of the form of (52).…”